Drilling attachment



59 i D. B. BULLARD 1958844 DRILLING ATTACHMENT Filed Aug. 1l. l93?. 3 Sheets-Sheet l INVENTOR. omfr. auw/70 TORN Y May 15, 1934. n, B. BULLARD 195844 DRILLING ATTACHMENT Filed'Aug. All, 1932 3 Sheets-3heet 2 I N V ENTOR.

May l5, 1934.

D. B. BULLARD 1,95%,844

DRILLING ATTACHMENT l Filed Aug. 11. 1932 3 Sheets-Sheet 3 7.8 t! 7/ v ,7.3m r fi" 7o 65 77 66 G72;A l o 1 76 S i E11-1D ai 1 5 l 7 c l so l 87m 9s I i r- I 1 l s r'- 89 87 IlV HI /as .LZ/6L, 5 11W/Emol@ Patented May 15, 1934 UNITED STATES 1,958,844 nnILLnvG ATTACHMENT Dudley B. Bullard, Southport, Conn., assigner to The Bullard Company, a corporation of Connectiout Application August 11, 1932. Serial No.' 628,313

' 9 Claims. (Cl. 29-38) It is among the objects of the present invention to provide a machine tool drill head of simple and eiiicient construction which is designed to be particularly efficient in operation.

One of the more specific objects is to provide a drill head particularly designed for high speed operation and arranged to be operated with the avoidance of excessive starting torques and starting or driving shocks.

Another object is to provide a drill head having a plurality of positively acting driving connections so that the high speed drive therefor may be arrived at through an initial low speed drive.

Another object is to provide a drill head with means for operating the drills thereof by and with the rotation of the work and in addition thereto to provide an insurance of proper registration of drill and work.

Other objects and more particularly those relating to structural features such as the combination and inter-relation of parts will be apparent from a consideration of the drawings, especially when made together with a study of the following specification.

While the present invention is broadly` applicable to various types of machine tools, the present embodiment of the inventive concept is particularly designed for use in connection with station type machine tools such as those known as the Mu1t-AuMatic, the structure of which is set forth in the Bullard Patent No. 1,360,175, which patent relates to a turning machine, it being understood that one or more of the work 5 stations may be provided with a drill head so that the machine may be used for a wide variety of operations.

That form oi the invention herein specifically 4 illustrated includes a rotatable body having a slow speed driving connection through an overrunning clutch and in addition thereto, it is provided with means to rotate the body at high speed with the work. Through suitable gearing,v rotation of the body will rotate the drill spindles on their own axes.

Another feature of the invention is the provision of particularly designedengaging means which is arranged so that the engagement of the rotatable body is prevented except upon predetermined registration of drill and work.

Other important features and structural combinations which lend themselves to the provision of a highly eflicient unit will become apparent hereinafter.

In the drawings:

Fig. l is a side elevation of the Mult-Au-Matic type of machine equipped with drill heads formed in accordance with `the present invention.

Fig. 2 is a vertical section through a single go spindle drill head formed in accordance with the present invention.

Fig. 3 is a section taken'on the line 3-3 of Fig. 2'. y

Fig. 4 is a section taken on the line 4-4 of 65 Fig. 2, and l v Fig. 5 is a vertical section through a multiplev spindle drill head formed in accordance with the present invention.

By reference to Fig. 1, it will be seen that one form of the present invention .is particularly designed for use on vertical station type multiple spindle machines of the Mult-Au-Matic type hereinbefore referred to. By reference to the patent hereinbeiore mentioned, the internal operating structure of the machine will be clearly understood and it is not believed to be necessary to dwell upon such details which form no part of the present invention. It is suicient, therefore, to say that the structure includes a base 10 which supports a step by step indexing carrier 11 in which are journaled rotatable spindles 12 carrying chucks or work -lixtures 13. From the-base 10 a central column 14- rises which supports on its various faces the tools 35 for operating upon the work 15.- The face 16 of the Acolumn is left free of tools so as to provide a loading station at which new work may be placed in the chuck and finished work is removed.

While the arrangement of tools and the selection thereof are a matter o1' choice which isbest determined by the character of the work, it will be seen that by way of illustration, the face 17 of the column is shown as being provided with a single spindle drill head 18. The drill head is mounted upon a slide 19 adapted to be vertically moved toward and away from the work. The feeding movement and the drive of the feed works forl the drill head are not shown since various operating structures may be used for this purpose, a preferred feed works being disclosed in the patent above referred to. Upon an adjacent face of the column a multiple spindle drill head 2l is mounted which is adapted to'be independently fed vertically toward and from the work. Mounted uponthecolumn 14 and inclosed in a suitable housing 22 are the individual feedworks for the heads. the driving motor for the machine being indicated at 23.

shown in Fig. 1 80 .use on machines instances be `effectively employed -on single spin- In the operation of the device, it will be understood that work pieces are loaded into the chuck or fixture 13 at the loading station 16 and the carrier 11 is indexed step by step to bring the work successively in line with the drill heads 18 and 21. The drills are first rotated by a drive shown in Figs. 2 and 5- and as the drill head is fed toward the work, flngers carried thereby engage the chuck or fixture to thus rotate the head with the rotation of the work.

It will be understood that in connection with a machine of this type, other instrumentalities may be used which in conjunction with the drill heads will turn out at each carrier a finished work piece. The invention is, therefore, not confined to machines of this type which are provided only with drilling tools nor is the drill head of the invention confined to of this type. It may, in some die machines or on machines having a plurality of spindles mounted in a continuously moving carrier wherein the work is rotated upon its own axis during its movement around the column.

With specific reference to Figs. 2, 3 and 4, it will be observedthat the head is supported for vertical movement on the face of the column or other support by securement to a tool slide .26 as by bolts 27 which secure flange 28 of a nonrotatable ,casing 29. The of the casing 29 carries an internally extending flange ring 31 which is received within aco;- operatingfannular groove of a rotatable clutch housing 32. The latter is carried by and rotates with the initial low-speed positive driving shaft 33. The housing 32 constitutes part of an'overrunning clutch which includes clutch rollers 34 received within tapering recesses 35 of a clutch hub 36, spring 37 being provided to urge the rollers towards the shallow ends of the recesses so that counter clockwise rotationci.' thel hub (Fig. 3) .is' possible at a speed greater thanthat of the housing 32. Thus, if the hub isjcaused` to rotate at a greater speed than that. of the housing, the rollers will roll against-the tension of the spring to the larger end oi." thezrecesses that of the shaft'33.

and thereby disengage the housing and thus permit a rotation of the hub ata higher speed than The hub 36 is mounted upon and for rotation with a central body 40, a suitable connection andmounting for the hub being 'illustretedin Fig. 3 as bytesquared end' ofthe body v40 extending through a correspondingly shaped aperture in the hub. Suitable bearings 41 and 42 are arranged to .retain'alignment of and prevent friction between the body '4o`jand to provideia securing and supporting portion 43 for its companion portion 45 which carries the drill spindle and which is bolted thereto for rotation therewith by bolts 46. The internal surface of the lower skirt of the casing 29 is provided with an internal annular gear 44 which meshes with and drives a pinion 47 mounted within the recessed top of the body portion 45 upon a shaft 48 which is suitably journaled within a socket 49 of.' the portion 45. The pinion 47 also meshes with a drill spindle drive pinion 50 which is' mounted upon a rotatable drill socket 51, the bearings 52 of which provide forits alignment and frlctionless rotation withinthebody 45. The drill 53 is suitably securedv within the socket 51 as by any conventional means. {.The

also carries apack-f..

lower skirt of the casing 29 movement of the upper end or neck 30 'rotationof the work` spindle.

ture vof the finger ends 'dons indicated in ing ringv 53Hl which lprovides a lubricating seal between the non-rotatable casing and the rotatable body.

For rotating the body at a speed higher than that at which it is driven through the overrunning clutch and by the shaft 33, chuck or fixture gripping fingers 57 are provided which are s eated within elongated tubular sections 54 of the body portion 45. Jig plate arms 55 of tubular formation are secured within the members 54 and support the jig plate 56 therebetween. Within the members 55, the fingers 57 are mountedand are urged outwardly by the spring 58.

With particular reference to Fig. 4, it will be :noted that the lower end of theflngers' 57 are, as

indicated by the 'dented une, provided with the chuck or fixture plates 60 are provided with inclined slots or recesses 61. the recesses 6l of the chuck or fixture face plate,y while being alike in configuration and the contour of their bottoni surface, are unlike in that the one to the left of the figure extends to the inner edge of the fixture ring which is open, while the one to the right has a band between the inner circumference of the fixture ring and the inner wall of the recess and extends outwardly to the outer edge of the ring which side vis open.

the rotation its outer surface which whereby it can register only with the path of the right hand recess, while 'that on thev left has the outer surface cut away and extends across to' form a continuation of the inner surface of the finger. Thus, the iinger ends and the recesses form pairs off center .with respect to the axis of By reference to the figures, it will be noted that the finger shown to the, right in Fig. 4 cannot possibly engage with the recess shown to thevleftin Fig. 4 and vice versa. Thusit will be noted that the spindle head-can be driven from the fixture plate only when `the fixture plate and spindle head are in av-predetermned aligned relationship.

It'wil-l, of course. tion of the device, the tool head moves downwardly and while so moving, the shaft 33 is revolved and, through the overrunning clutch, picks up the internal body and rotates it about its own axis,

which rotation, through the engagement of the `t`h 4th the non-rotatable casing 29. The lower end "of mman 7 W1 h; e xed annular pmmn 4 o t e `1 1 ttendru d1 the body 40 extends outwardly andfis enlarged non mtatab e Casmg W1 1 ro a t e *1 Spm e on its'own axis. As the head moves downward'- ly, however, the face plate and are free to move further since the fingers will move up withintheir sockets against the tension of their forcing spring. v

From the discussion of the cooperating strucwill be observed that the chuck or fixture will be be obvious that in the opera- 15 fingers are moved against the and the face plate recesses,

free toccontinue its rotation during the contact of the fingers and without driving the head until such timeas the .proper finger is in alignment with then proper recess, or, in other words, until thehead and-chuck assume the respective loca- Fig. 4. Should the fingers strike the face plate out of thealignment as shown in Fig.` 4. 'thevfwill not be picked up by the face plate andthe-right handnger of Fig. 4will pass over the left recess of Fig. 4 without engaging therewith. y

'Io avoid the danger of continued rotation of the head after the head is withdrawn from the face plate and to retard its extra rotation, a sin:- ple band brake as illustrated at 64 in Figs. 2 and 5 and also as shown completely in Fig. 1 may be employed.

By reference to that structure illustrated in Fig. 5, it will be seen that the inventive concept is not restricted to a single spindle dri'll head nor to the precise structure illustrated in Fig. 2. While the drill head shown in Fig. 5 is in many ways substantially like that shown in Fig. 2, it diilersl in certain respects as for instance, in the provision of a structure having not one but a plurality of drill spindles which may be evenly distributed about the axis of the rotating body or which may be unevenly distributed.

The upper end of the shaft 76 is provided with a bearing 77 between the shaft and the casing while a second aligning bearing 78 is provided mounted in a bearing box 79, secured as bolts 80 from fthe stationary casing 68. The rotatable body 77 is mounted on the shaft 76 for rotation therewith, theshaft terminating in a flange 81 which forms aishoulder,l for the reception of the body. The body has aplurality-of vertical bores 82 within which the drillspindles 83, are mounted, i' bearing 84 being provided for properlyaligning thedrillspigdles. ...Each spindle is provided at its vreamer or counter-bore tool'may be carried by the drill spindles, such tools being here illustrated and identified by thenumeral?- distinct from that forni oi the invention shown in Fig.

y2, it will be seen that this form of the invention is particularly designed as a multiple spindle drill head. The hisertion and removal of toolsris rendered easy by the-provision of radial apertures 88 in the body which communicate with the conventional apertures in the drill spindle.

The drill head is designed to carry a jig plate 89 which is supported by a central rod 90 received within a central bore of the shaft 76, a spring 91 being provided to normally urge the jig plate downwardly. One or more side guide rods 92 may be provided for the jig plate, their upper ends extending into bores of the body and having heads 93 adapted to abut a threaded stop ring 94 so as to limit the outward movement of the jig.

As in the case of that form of the invention shown in Fig. 2, means are provided f ordriving the body from the chuck or xture. 'Thus, the body is provided with tubular sections '95 which mount therein gripping iingers 96 which are normally urged outwardly by springs 97. The ends of the fingers 96 terminate in squared ends 98 which are the counter-part of the ends'59' of the fingers 57. The face of the chuck or xture 99 is indicated as having the characteristic recesses as indicated at 6l in Fig. 4. Thus, the automatic driving of the body by' the work holders will be accomplished and the insurance of predetermined registration of Work and drills will be accomplished in the manner hereinbefore set bodyand a pair of independentv positive driving forth.

like operations. It will be understood that the invention has' been illustrated' in only someof its many structural embodiments and that nume!"-A ouschanges, modiflcations and the full use of equivalents may be resorted to without departmg from the spirit or scope of the appended cla1ms.

I claim:

1. A machine of the class described including the combination of a horizontal bed, means for rotating it about a central axis, work stations arranged about said axis above said bed, a drill head located at one of the Work stations, rotating work holders mounted in the bed for rotation on their own axis on the work station, and means for rotating the drill by rotation of the work holders, and means for initially operating the -drill independent of the work holders, said means for operating the drill from the Work holdoperate only when the drill and Work havevv asfv sumed a predetermined denite'relationship.

3. In a drill head, a rotatable body. a drill,

means to cause rotation of the drill by rotation of the body, means on said body to engage a work vholder whereby the body will be revolved therewith, and means to rotate said body independent of said last mentioned means. i

4. In a drill head, a rotatable body, a-drill,

means to cause rotation of the drill by rotation of the body, means on said body toengage a work v holder whereby the body will be revolved therewith, and means to rotate said body independent of the saidlast mentioned'means, said means including an overrunning clutch whereby the body .may be moved at a slower speed than that which -may be imparted thereto'by the work holder.

5. In a drill head, a rotatable body,` a drill spindle mounted therein and rotatable on its own axis, and a pair'of lindependent'means for rotating said body, and means forrotating said spindle on its own axis by rotation of said body.

6. In a drill head, a nonrotatable vertically moving casing, a rotatable body mounted by said casing, a -drill spindle mounted within said body and rotatable on-its-own axislbyrota'tion of said body and a pair-of independent positive driving '7. In a drill head, a non-rotatable vertically moving casing, a rotatable body mounted by said casingf'a drill spindle mounted within said body Aand rotatable on its own axis by rotation o! said body and a pair of independent positive driving means for. said body, one of said means including an overrunning clutch.

8. .In a drill head, a nom-rotatable vertically moving casing", a rotatablefbody mounted by said casing, a drill lspindle mounted within said body and rotatable on its own axis by rotation of said means for said body, one of said means being adapted to establish driving connection through the vertical movement of said casing.

9. In a drill head, a non-rotatable casing, a

rotatable body mounted by said easing, a -plurality of drill spindles mounted by said body and rotatable upon their own axis, driving connecsaid body.

DUDLEY B. BUILARD. 

